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authorMiklos Szeredi <mszeredi@suse.cz>2011-08-24 10:20:17 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-29 14:08:09 -0700
commit7b1ef6c0a199bd93899f167f459627dd9421913a (patch)
tree21127c35bef51ac8fdc58a3d6c976b3c09714e0e
parent035fac5844e2cbc3bb485b6d274b4266c27aeeb2 (diff)
fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message
commit c2183d1e9b3f313dd8ba2b1b0197c8d9fb86a7ae upstream. FUSE_NOTIFY_INVAL_ENTRY didn't check the length of the write so the message processing could overrun and result in a "kernel BUG at fs/fuse/dev.c:629!" Reported-by: Han-Wen Nienhuys <hanwenn@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/fuse/dev.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 650546f8612d..1facb3956a90 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -899,6 +899,10 @@ static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
if (outarg.namelen > FUSE_NAME_MAX)
goto err;
+ err = -EINVAL;
+ if (size != sizeof(outarg) + outarg.namelen + 1)
+ goto err;
+
name.name = buf;
name.len = outarg.namelen;
err = fuse_copy_one(cs, buf, outarg.namelen + 1);